<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <style type="text/css">
        #p1{font-weight: 100;}
        #p2{font-weight: 400;}
        #p3{font-weight: 700;}
        #p4{font-weight: 900;}
    </style>
</head>
<body>
    <p id="p1">字体粗细为:100(lighter)</p>
    <p id="p2">字体粗细为:400(normal)</p>
    <p id="p3">字体粗细为:700(bold)</p>
    <p id="p4">字体粗细为:900(bolder)</p>
</body>
</html>
